18-(     )=8

12-(     )=4

16-(     )=7

12-(     )=9

15-(     )=2

19-(     )=11

17-(     )=10

18-(     )=10

12-(     )=4

17-(     )=7

14-(     )=7

18-(     )=0

13-(     )=5

11-(     )=9

19-(     )=8

20-(     )=17

17-(     )=13

13-(     )=6

15-(     )=1

18-(     )=17

16-(     )=16

16-(     )=2

19-(     )=0

17-(     )=16

14-(     )=0

17-(     )=13

18-(     )=17

15-(     )=3

18-(     )=8

20-(     )=12

14-(     )=5

19-(     )=11

20-(     )=16

16-(     )=14

15-(     )=4

15-(     )=12

20-(     )=6

11-(     )=4

14-(     )=1

12-(     )=2

13-(     )=0

17-(     )=0

19-(     )=1

18-(     )=8

17-(     )=13

18-(     )=13

14-(     )=10

13-(     )=9

13-(     )=0

20-(     )=7